Ecumenical Patriarch Nikolaos I

Ecumenical Patriarch Nikolaos I (853-925) was the Ecumenical Patriarch of Constantinople from 901 to 907 (succeeding Ecumenical Patriarch Antonios II and preceding Ecumenical Patriarch Euthymios I) and from 912 to 925 (succeeding Euthymios and preceding Ecumenical Patriarch Stephanos II).

Biography
Nikolaos was appointed as the Patriarch of Constantinople in 901, and he reigned for six years before being deposed due to his support of Andronikos Doukas' revolt. In 912 he regained power under Alexander of Byzantium, and he reigned until his death.